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2013 Vol.29, Issue 12 Preview Page
Effect of Cycles of Wetting and Drying on the Behavior of Retaining Walls Using Reduced-Scale Model Tests

축소 모형실험을 이용한 습윤-건조 반복작용이 옹벽 구조물의 거동에 미치는 영향

Chung-Sik Yoo1*
,
Dong-Wook Jang2
유 충식1*
,
장 동욱2
1Prof., School of Civil & Architecture Engrg., Sungkyunkwan Univ.
2Graduate Student, Department of Civil and Environmental Engrg., Sungkyunkwan Univ.
1성균관대학교 건축토목공학부 교수
2성균관대학교 건설환경시스템공학과 전 석사과정
*교신저자. *Corresponding Author. 
31 December 2013. pp. 25-34
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Abstract

This paper presents the results of a reduced-scale physical model investigation into the behavior of retaining walls subject to cycles of wetting and drying due to rainfall infiltration. Reduced-scale model walls equipped with a water spraying system that can simulate the wetting process were first constructed and a series of tests were conducted with due consideration of different rainfall intensities and backfill soil types. The results indicate that cycles of wetting and drying process have adverse effects on the wall behavior, increasing wall deformation as well as earth pressure acting on the wall, and that the first cycle of wetting and drying process has more pronounced effect on the wall performance than the ensuing cycles. It is also shown that the degree to which the wetting and drying cycles affect the wall behavior depends greatly on the backfill soil type, and that the larger the fine contents, the greater is the effect of cycles of wetting and drying on the wall behavior. Practical implications of the findings from this study are discussed in great detail.

Keywords
Reduced scale model test
Retaining wall
Braced excavation
Rainfall infiltration
Wetting and drying
Matric suction

본 논문에서는 계절적 환경변화로 인한 습윤-건조 반복과정에 노출되는 옹벽구조물의 거동에 관한 축소 모형실험 연구 내용을 다루었다. 이를 위해 먼저 습윤-건조 과정을 모사할 수 있는 모형 옹벽 실험 장치를 구축하고 강우강도 및 뒤채움흙의 종류 등을 매개변수로하여 다양한 조건에 대한 실험을 수행하였다. 그 결과 강우로 인한 습윤-건조 반복 과정은 옹벽의 변위를 증가시키고 토압을 증가시키는 등 거동 측면에서 불안정성을 야기시킬 수 있는 인자로 검토되었다. 한편, 전반적으로 첫 번째 습윤-건조 사이클에서 변위가 가장 크게 발생하고 그 이후 습윤 사이클에서의 변위 증가량은 사이클이 진행되면서 감소되는 것으로 관찰되었다. 아울러 이러한 습윤-건조 반복과정의 영향은 뒤채움흙의 종류에 따라 그 정도가 차이나는 것으로 나타났으며 세립분 함유량이 클수록 습윤-건조 반복작용의 영향이 큰 것으로 검토되었다.

References
1
1.Bishop, A. W. (1959), The principle of effective stress. Publication 32, Norwegian Geotechnical Institute, Oslo, Norway, pp.1-4.
2
2.Cheuk, C.Y., Ng, C.W.W., and Sun, H.W. (2005), Numerical experiments of soil nails in loose fill slopes subjected to rainfall infiltration effects. Computers and Geotechnics, Vol.32, No.4, pp. 290-303.
3
3.Lee, K.H., Jeong, S.S., and Kim, T.H. (2007), Effect of Fines on the Stability of Unsaturated Soil Slopes, Journal of Korean Geotechnical Society,Vol.23, No.3, pp.101-109.
4
4.Lee, S.R., Oh, T.K., Kim, Y.K., and Kim, H.C. (2009), Influence of Rainfall Intensity and Saturated Permeability on Slope Stability during Rainfall Infiltration, Journal of Korean Geotechnical Society, Vol.25, No.1, pp.65-76
5
5.Rahardjo, H., Nio, A. S., Leong, E. C., and Song, N. Y. (2010), Effects of Groundwater Table Position and Soil Properties on Stability of Slope during Rainfall, Journal of Geotechnical and Geoenvironmental Engineering, Vol.36, No.11, pp.1555-1564.
6
6.Rahardjo, H., Ong, T.H., Rezaur, R.B., and Leung, E.C. (2007), Factors Controlling Instability of Homogeneous Soil Slope under Rainfall, Journal of Geotechnical and Geoenvironmental Engineering, Vol.133, No.12, pp.1532-1543.
7
7.Rahimi, A., Rahardjo, H., Leong, E. C., and M. ASCE. (2011), Effect of Antecedent Rainfall Patterns on Rainfall-Induced Slope Failure, Journal of Geotechnical and Geoenvironmental Engineering, Vol.137, No.5, pp.483-491.
8
8.Sagong, M., Yoo, J.H., and Lee, S.J. (2009), Analysis on the Rainfall Triggered Slope Failure with a Variation of Soil Layer Thickness: Flume Tests, Journal of Korean Geotechnical Society, Vol.25, No.4, pp.91-103
9
9.Tohari, A., Nishigaki, M., and Komatsu, M. (2007), Laboratory Rainfall-Induced Slope Failure with Moisture Content Measurement, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 133, No.5, pp.575-587.
10
10.Tsaparas, I., Rahardjo, H., Toll, D.G., and Leong, E.C. (2002), Controlling parameters for rainfall-induced landslides. Computers and Geotechnics, Vol.29, No.1, pp.1-27.
11
11.Yoo, C. (2011), Effect of Cyclic Drying-Wetting on Compressive Strength of Decomposed Granite Soils, Journal of Korean Geo-synthetic Society, Vol.10, No.4, pp.11-20.
12
12.Yoo, C. (2013), Numerical Investigation into Behavior of Retaining Wall Subject to Cycles of Wetting and Drying, Journal of Korean Geotechnical Society, Vol.29, No.1, pp.13-22. 
13
13.Yoo, C., Kim, S.B., and Han, J.Y. (2008b), Numerical Investigation on the Stability of Reinforced Earth Wall during Rainfall, Journal of Korean Geotechnical Society, Vol.24, No.12, pp.1-12.
14
14.Yoo, C., Kim, S.B., and Jung, H.S. (2008a), Performance of a Chimney Drain in Reinforced Earth Wall for Reduction of Pore Water Pressure During Rainfall – a Numerical Investigation, Journal of Korean Geotechnical Society, Vol.24, No.5, pp.99-106. 
15
15.Zhan, L.T. and Ng, C.W.W. (2004), Analytical Analysis of Rainfall Infiltration Mechanism in Unsaturated Soils. International Journal of Geomechanics, Vol.4, No.4, pp.273-284.
Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 29
  • No :12
  • Pages :25-34
  • Received Date : 2013-07-09
  • Revised Date : 2013-09-21
  • Accepted Date : 2013-11-12
  • DOI :https://doi.org/10.7843/kgs.2013.29.12.25
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